(20) Glass Bubble: Do not allow open pores; circular bubble diameter <0.5mm, limited number, diameter 0.5 ≦ L <1.5mm, 5.5 times the area allowed number; diameter 1.5mm ≦ L <3mm, allow the presence of a number of times the assembly area; diameter> 3mm, No; square bubbles wide W≤0.5mm, diameter <1.5mm, limited number, diameter 1.5 ≦ L <3mm, allow the existence of a number of times the area; diameter 3mm ≦ L <5mm, 0.5 times the allowed number of assembly area; diameter> 5mm, No; width 0.5 ≦ L <1.5mm, diameter <1.5mm, 5.5 times the number allowed in the assembly area, the diameter of 1.5 ≦ L <3mm, allowed a number of times area; diameter> 3mm, allowed
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